如何在Django Rest框架序列化程序中实现多个输出表示

from rest_framework import serializers

class MySerializer(serializers.Serializer):
    field1 = serializers.CharField()
    field2 = serializers.IntegerField()
    # 定义其他字段...

class MySerializer(serializers.Serializer):
    field1 = serializers.CharField()
    field2 = serializers.IntegerField()

    def to_representation(self, instance):
        # 自定义输出表示1
        representation = super().to_representation(instance)
        representation['field1'] = representation['field1'].upper()
        return representation

    def to_representation2(self, instance):
        # 自定义输出表示2
        representation = super().to_representation(instance)
        representation['field2'] = representation['field2'] * 2
        return representation

from rest_framework.response import Response
from rest_framework.views import APIView

class MyView(APIView):
    def get(self, request):
        data = {'field1': 'value1', 'field2': 10}
        serializer = MySerializer(data=data)
        serializer.is_valid(raise_exception=True)
        
        # 使用默认输出表示
        default_representation = serializer.data
        
        # 使用自定义输出表示1
        representation1 = serializer.to_representation(serializer.instance)
        
        # 使用自定义输出表示2
        representation2 = serializer.to_representation2(serializer.instance)
        
        return Response({
            'default_representation': default_representation,
            'representation1': representation1,
            'representation2': representation2
        })